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Doppler physics

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https://www.readbyqxmd.com/read/27910558/preliminary-measurements-of-the-edge-magnetic-field-pitch-from-2-d-doppler-backscattering-in-mast-and-nstx-u-invited
#1
R G L Vann, K J Brunner, R Ellis, G Taylor, D A Thomas
The Synthetic Aperture Microwave Imaging (SAMI) system is a novel diagnostic consisting of an array of 8 independently phased antennas. At any one time, SAMI operates at one of the 16 frequencies in the range 10-34.5 GHz. The imaging beam is steered in software post-shot to create a picture of the entire emission surface. In SAMI's active probing mode of operation, the plasma edge is illuminated with a monochromatic source and SAMI reconstructs an image of the Doppler back-scattered (DBS) signal. By assuming that density fluctuations are extended along magnetic field lines, and knowing that the strongest back-scattered signals are directed perpendicular to the density fluctuations, SAMI's 2-D DBS imaging capability can be used to measure the pitch of the edge magnetic field...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910367/applications-of-doppler-free-saturation-spectroscopy-for-edge-physics-studies-invited
#2
E H Martin, A Zafar, J B O Caughman, R C Isler, G L Bell
Doppler-free saturation spectroscopy provides a very powerful method to obtain detailed information about the electronic structure of the atom through measurement of the spectral line profile. This is achieved through a significant decrease in the Doppler broadening and essentially an elimination of the instrument broadening inherent to passive spectroscopic techniques. In this paper we present the technique and associated physics of Doppler-free saturation spectroscopy in addition to how one selects the appropriate transition...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27906477/blood-pressure-measurements-in-780-apparently-healthy-cats
#3
J R Payne, D C Brodbelt, V Luis Fuentes
BACKGROUND: Mean systolic blood pressure in apparently healthy cats has been reported as approximately 125 mmHg using direct assessment, but there is greater variability in reported values using indirect assessment. Increasing age and the white-coat effect are associated with increased systolic blood pressure. HYPOTHESIS/OBJECTIVES: To report Doppler-derived blood pressure measurements from a large population of apparently healthy cats and to assess epidemiologic factors associated with recorded blood pressures...
December 1, 2016: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/27904914/testicular-infarction-in-a-patient-with-spinal-cord-injury-with-epididymitis-a-case-report
#4
Po-Cheng Hsu, William J Huang, Shih-Fong Huang
: O-bjective: To describe a case of epididymitis-related testicular infarction in a patient with spinal cord injury. CASE REPORT: A 22-year-old man with a traumatic spinal cord injury (American Spinal Injury Association Impairment Scale A; neurological level, C4) developed epididymitis during hospitalization. He presented with spiking fever, autonomic dysreflexia, and increased spasticity. Physical examination revealed a rapidly progressive, firm swelling of the right hemiscrotum; however, the patient had no subjective complaint of pain owing to a loss of sensation...
November 30, 2016: Journal of Rehabilitation Medicine
https://www.readbyqxmd.com/read/27895320/clinical-experience-with-pancreas-graft-rescue-from-severe-thrombus-after-simultaneous-pancreas-kidney-transplantation-by-early-detection-with-doppler-ultrasound-a-case-report
#5
Mitsunobu Takeda, Daisaku Yamada, Hidetoshi Eguchi, Tadafumi Asaoka, Takehiro Noda, Hiroshi Wada, Kunihito Goto, Koichi Kawamoto, Yutaka Takeda, Masahiro Tanemura, Toshinori Ito, Masaki Mori, Yuichiro Doki
BACKGROUND Graft thrombosis is the main cause of early graft loss after transplantation. In Japan, pancreases available for transplantation are frequently from marginal donors due to diverse backgrounds in the population. However, marginal tissues increase the risk of early thrombosis in the graft. CASE REPORT Here, we describe a 41-year-old woman with type 1 diabetes mellitus who underwent a simultaneous pancreas-kidney transplantation. The pancreas was retrieved from a 34-year-old man who had experienced severe hemodynamic instability...
November 29, 2016: American Journal of Case Reports
https://www.readbyqxmd.com/read/27881009/late-cardiac-effect-of-anthracycline-therapy-in-physically-active-breast-cancer-survivors-a-prospective-study
#6
A C Nagy, P GulAcsi-BArdos, Z CserEp, L Hangody, T Forster
The late-onset cardiotoxic effect of anthracycline is known, however the early detection and prevention of subclinical myocardial damage has not been fully understood yet. Besides medical therapy regular physical activities may also play a role in the prevention and reduction of side effects of chemotherapy. The aim of our present study was to detect the effect of regular physical activities on the diastolic function and on the symptoms of late heart failure in case of anthracycline chemotherapy. The prospective study included 55 female patients (age 31-65 year, average 49...
November 24, 2016: Neoplasma
https://www.readbyqxmd.com/read/27866375/pre-operative-assessment-for-arteriovenous-fistula-placement-for-dialysis
#7
REVIEW
Maria G Marques, Pedro Ponce
Native AV fistulas are considered to be the best VA for most dialysis patients. A careful preoperative process of care is essential to maximize the proportion of fistulas that achieve adequacy for dialysis. An individualized and timely evaluation of patients starts early with the identification of risk factors, followed by a physical examination which should be complemented by ultrasound vascular mapping in most cases. Vascular mapping includes any technique that leads to information on patient's inflow and outflow anatomy (± hemodynamics) as they relate to arteriovenous access creation and may predict maturation...
November 20, 2016: Seminars in Dialysis
https://www.readbyqxmd.com/read/27845933/feasibility-study-of-compton-cameras-for-x-ray-fluorescence-computed-tomography-with-humans
#8
Don Vernekohl, Moiz Ahmad, Garry Chinn, Lei Xing
X-ray fluorescence imaging is a promising imaging technique able to depict the spatial distributions of low amounts of molecular agents in vivo. Currently, the translation of the technique to preclinical and clinical applications is hindered by long scanning times as objects are scanned with flux-limited narrow pencil beams. The study presents a novel imaging approach combining x-ray fluorescence imaging with Compton imaging. Compton cameras leverage the imaging performance of XFCT and abolish the need for pencil beam excitation...
December 21, 2016: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/27828851/a-case-report-of-a-giant-right-ventricular-outflow-tract-in-a-young-man
#9
Die Hu, Dao-Quan Peng, Xiang-Ping Li, Bi-Lian Yu
INTRODUCTION: Localized pericardium restriction is a rare disease and likely to be unrecognized owing to the atypical manifestation, even after diagnostic avenues are exhausted. Recognizing the red flags of the disease could timely spark a preliminary suspicion of the disease and thus contribute to the early application of relevant examinations. CASE PRESENTATION: We will here report a case of a 21-year-old young man with a giant right ventricular outflow tract...
November 2016: Medicine (Baltimore)
https://www.readbyqxmd.com/read/27824313/evidence-of-a-metabolic-reserve-in-the-skeletal-muscle-of-elderly-people
#10
Gwenael Layec, Joel D Trinity, Corey R Hart, Yann Le Fur, Jacob R Sorensen, Eun-Kee Jeong, Russell S Richardson
The purpose of the present study was to determine whether mitochondrial function is limited by O2 availability or the intrinsic capacity of mitochondria to synthesize ATP in elderly individuals. To this aim, we examined, in comparison to free-flow conditions (FF), the effect of superimposing reactive hyperemia (RH), induced by a period of brief ischemia during the last min of exercise, on O2 availability and mitochondrial function in the calf muscle. 12 healthy, untrained, elderly subjects performed dynamic plantar flexion exercise and phosphorus magnetic resonance spectroscopy ((31)P-MRS), near-infrared spectroscopy (NIRS), and Doppler ultrasound were used to assess muscle metabolism and peripheral hemodynamics...
November 6, 2016: Aging
https://www.readbyqxmd.com/read/27817784/-unexpected-cutaneous-purpura-in-an-infant
#11
Yang-Yang Luo, Zhu Wei, Ying-Hong Zeng, Bin Zhou, Jian-Ping Tang
A two-month-old boy visited the hospital due to unexpected cutaneous purpura and thrombocytopenia for 2 days. The physical examination revealed a purple mass on the back. The soft tissue color Doppler ultrasound showed rich blood signals in the tissue, and the results of bone marrow puncture indicated an increased number of megakaryocytes. After the treatment with hormone and gamma globulin, the platelet count rapidly increased and maintained at a normal level. Meanwhile, the boy was given oral administration of propranolol...
November 2016: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/27814280/l-arginine-as-dietary-supplement-for-improving-microvascular-function
#12
Ziva Melik, Polona Zaletel, Tina Virtic, Ksenija Cankar
BACKGROUND: Reduced availability of nitric oxide leads to dysfunction of endothelium which plays an important role in the development of cardiovascular diseases. OBJECTIVE: The aim of the present study was to determine whether the dietary supplement L-arginine improves the endothelial function of microvessels by increasing nitric oxide production. METHODS: We undertook experiments on 51 healthy male volunteers, divided into 4 groups based on their age and physical activity since regular physical activity itself increases endothelium-dependent vasodilation...
November 4, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27805514/relation-between-pulmonary-hypertension-and-health-related-quality-of-life-in-patients-undergoing-hemodialysis
#13
Tülay Kıvanç, Öznur Kal, Öznur Çiftçi, Şule Akçay
OBJECTIVES: Pulmonary hypertension has been reported to occur in a considerable proportion of patients with end-stage renal disease. End-stage renal disease affects the health-related quality of life of patients. There is a lack of specific information on the relation between pulmonary hypertension and health-related quality of life in patients with end-stage renal disease in the literature. We aimed to evaluate this relation in patients undergoing hemodialysis. MATERIALS AND METHODS: This prospective case-control study included 68 patients treated with hemodialysis and 30 healthy participants as controls...
November 2016: Experimental and Clinical Transplantation
https://www.readbyqxmd.com/read/27792071/presentation-of-testicular-torsion-in-the-emergency-department
#14
Melanie Ann Kroger-Jarvis, Gordon Lee Gillespie
Testicular torsion is a urological emergency affecting 3.8 per 100,000 males younger than 18 years. Differential diagnosis of the acutely painful scrotum is crucial for the advance practice nurse to understand. Advanced practice nurses should consider the differential diagnosis of testicular torsion for any patient with testicular pain despite the patient's age, history, or physical examination findings. The standard of care for a patient with testicular pain to rule out testicular torsion is a Doppler ultrasound scan and an emergent urology consult...
October 2016: Advanced Emergency Nursing Journal
https://www.readbyqxmd.com/read/27769805/bodybuilding-induced-mondor-s-disease-of-the-chest-wall
#15
Christian Tröbinger, Christian J Wiedermann
OBJECTIVE: To describe the association of bodybuilding abdominal exercise with the development of superficial sclerosing thrombophlebitis of the anterolateral thoracoabdominal wall. DESIGN: A single case study. SETTING: University-affiliated regional community hospital. CASE DESCRIPTION: A 54-year-old man presented with an otherwise unremarkable past medical history 4 weeks after the start of left-sided chest discomfort...
September 4, 2016: Physical Therapy in Sport
https://www.readbyqxmd.com/read/27767971/inflammation-induced-microvascular-dysfunction-in-obesity-a-translational-approach
#16
Maria das Graças Coelho de Souza, Luiz Guilherme Kraemer-Aguiar, Eliete Bouskela
Obesity is a crescent epidemic in the world, affecting more than half a billion of adults worldwide. Obesity is associated to main cardiovascular risk factors, such as insulin resistance, type 2 diabetes mellitus, high blood pressure and dyslipidemia. The excessive adiposity causes a dysregulation of adipokines secretion by adipose tissue, upregulating the expression of pro-inflammatory adipokines and downregulating the anti-inflammatory ones. This scenario contributes for the appearance of atherosclerosis...
October 18, 2016: Clinical Hemorheology and Microcirculation
https://www.readbyqxmd.com/read/27749228/adding-ultrasound-to-clinical-examination-reduced-frequency-of-enthesitis-in-primary-care-psoriasis-patients-with-musculoskeletal-complaints
#17
Myrthe van der Ven, Maren C Karreman, Angelique E A M Weel, Ilja Tchetverikov, Marijn Vis, Tamar E C Nijsten, Johanna M W Hazes, Jolanda J Luime
OBJECTIVES: Part of the psoriasis patients with musculoskeletal complaints will have inflammation of the entheses. Entheseal inflammation is difficult to assess by clinical examination only. Therefore, we aimed to determine the frequency of clinically relevant ultrasound inflammation at the most commonly assessed entheses (MASEI; Madrid Sonographic Enthesis Index) in primary care psoriasis patients with one or more tender entheses. METHODS: Adult primary care psoriasis patients with musculoskeletal complaints (tender enthesis or arthritis at physical examination) had an ultrasound examination of seven entheses according to the MASEI...
September 8, 2016: Clinical and Experimental Rheumatology
https://www.readbyqxmd.com/read/27743924/endovascular-treatment-of-the-subclavian-artery-steno-occlusive-disease
#18
Andrey Karpenko, Vladimir Starodubtsev, Pavel Ignatenko, Alexander Gostev
OBJECTIVE: The aim of our study was to compare immediate and long-term results of endovascular interventions for the treatment of steno-occlusive disease of subclavian arteries (SAs) depending on the length of lesion. MATERIALS AND METHODS: Between 2010 and 2013, we performed 245 endovascular procedures to treat patients with atherosclerotic steno-occlusive disease of SAs. All patients were examined and subdivided according to the received results into 2 groups: 125 patients with stenosis of SA were included in the first group and 120 patients with occlusion of SA were included in the second group...
October 12, 2016: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/27734441/evaluation-of-two-junctional-tourniquets-used-on-the-battlefield-combat-ready-clamp%C3%A2-versus-sam%C3%A2-junctional-tourniquet
#19
Jean-Guillaume Meusnier, Charles Dewar, Erti Mavrovi, Frederic Caremil, Pierre-Francois Wey, Jean-Yves Martinez
BACKGROUND: Junctional hemorrhage (i.e., between the trunk and limbs) are too proximal for a tourniquet and difficult to compress. These hemorrhages are responsible for 20% of preventable deaths by bleeding on the battlefield. The majority of these involve the groin area. Devices allowing a proximal compression for arterial axes have been recently developed. OBJECTIVE: The purpose of this study was to compare the use of two junctional- tourniquet models, the Combat Ready Clamp (CRoC®) and the SAM® Junctional Tourniquet (SJT), in simulated out-of-hospital trauma care when tourniquets were ineffective to stop the arterial flow...
2016: Journal of Special Operations Medicine: a Peer Reviewed Journal for SOF Medical Professionals
https://www.readbyqxmd.com/read/27733531/semen-quality-impairment-is-associated-with-sexual-dysfunction-according-to-its-severity
#20
F Lotti, G Corona, G Castellini, E Maseroli, M G Fino, M Cozzolino, M Maggi
STUDY QUESTION: Is sexual dysfunction associated with severity of semen quality impairment in men with couple infertility? SUMMARY ANSWER: In males of infertile couples the prevalence of erectile dysfunction (ED) increases as a function of semen quality impairment severity. WHAT IS KNOWN ALREADY: Infertile men are at a higher risk for sexual dysfunction, psychopathological and general health disorders. However, it has never been systematically investigated if these problems are associated with severity of semen quality impairment...
October 12, 2016: Human Reproduction
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